Nut-lock.



W. F. KENNBYK NUT LUCK.

APPLICATION FILED ROY .22, 1909.

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A'T'T'BHNEY WILLIAM B.'=KENNE;Y, OF PROVIDENCE, RHODE ISLAND.

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Specification of Letters Patent.

Patented June 20, 1911.

Application filed November 22, 1909. Serial No. 529,474.

' To all whom it may concern:

Be it known that I, WILLIAM F. KENNEY,

a citizen of the United States, residing at- Providence, in the State of Rhode Island, have invented a new and useful Improvement in Nut-Locks, of which the following is a specification.

In a certain class of nut-locks 'in which i right and left hand screw threads are em- 1o.

ployed upon the exterior of the bolt, in combination with reversely threaded holding and locking nuts, it is found that in order to prevent the occurrence of backlash in the use of the nut-lock, it is essential that an locking nuts, instead of using the outer side. of the holding nut, for a bearing seat, as,

internal shoulder should be interposed as a bearing seat, between the said holding and heretofore; and my invention conslsts in the employment of an interior bearing shoulder between the holding and locking nuts, where by backlash in the nut-lock will be prevented.

In the accompanying drawing Figure 1 represents a side view of the bolt and an axial section of the locking nut and the holdin nut. Fig. 2 represents an axial section 0 the holding nut. Fig. 3 represents an outer end view of the holding nut. Fig. 4 is a diagram representing thejresulting form of the locking threads, when theyare not coincident with each other, and the hold ing nut is screwed up to its seat.

In the drawing A represents a screw bolt' provided with the screw thread '6', and the extension 0, of smaller diameter than the body (1 of the bolt, the said extension being provided with a screw thread 6 of reverse inclination to that of. the screw thread I), the screw thread I being shown as a right hand thread, and the screw thread 6 as a left hand thread in the drawing.

The holding nut F is provided with a screw thread 9, fitting the thread 6 of the bolt, and also with a reverse screw thread 71. of a pitch which corresponds to that of the thread 6 upon the extension 0; and a locking -nut I is provided with a tenon m, having upon its exterior a screw thread j, fitting the screw thread it and an internal screw thread 70 fitting the thread a of the said extension. The nut- F is also provided with a shoulder Z, and the distinctive feature of my invention consists in arranging the shoulder Z in such a position relatively to the locking nut I that the end of'the tenon m of the locking nut may in all cases be brought up against the said shoulder, and by this means any .liability of backlash movement of the holding nut will be prevented.

In effecting the proper adjustment of my improved nut lock, the holding nut F is first to be screwed up to its proper tight bearing, and then turned slightly back in order that the locking nut I may be in all cases screwed up tightly to its seat at the shoulder Z of the holding nut, and then when the holding nut is screwed u to its seat, the said holding nut will be rmly locked upon the bolt, the screw threads h and j becoming transformed in the inclination of their sides as shown in Fig. 4, owing to the cramping of the threads, whenever the holding nut has been turned to a position in which the thread j of the holding nut does not coincide in position with the thread a of the extension 0; and in some cases on account of this distortion of the thread, the locking nut I should be again tightened up to its limiting shoulder.

I claim as my invention 1. In a nut-lock, the combination of a bolt having upon its exterior both right and left hand screw threads, with a holding nut and a, locking nut fitting the said screw threads of the bolt, respectively, one of the nuts being provided with an externally screw- .threaded tenon, and the other with an internal screw-thread, and also with an internal bearing shoulder adapted for engagement with the said tenon, the said engaging parts of the nuts being screwed up to contact with each other when the nut-lock is in use, whereby backlash in the action of the nut-lock will be prevented.

2., In a nut-lock, the combination of abolt having upon its exterior both right and left handscrew threads, with a holding nut and a locking nut, fitting the said screw threads of the bolt, respectively, one of the nuts being provided with an I externally screwthreaded tenon, and the other With an in resulting distortion of the parts in engage ternal screw-thread adapted for engagement, and backlash in the action of the nutment With the said external thread of the lock be prevented.

tenon; and also provided with an internal WILLIAM F. KENNEY. 5 bearing shoulder adapted for engagement Vitnesses:

with the said tenon, whereby the said nuts SOORATES SCHOLFIELD,

may be screwed together upon the bolt with CHAS. E. SMITH. 

